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Biblioteca Hispanica : Treaty Movement and Water Applications

By: Jose Mariano Vallejo

Description: Hydrodynamics

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Biblioteca Hispanica : Manual Natural History, 1883

By: Luis De Vallejo and Pando
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Applied Physics Letters : Multilevel sensitization of Er3+ in low-...

By: Oleksandr Savchyn, Ravi M. Todi, Kevin R. Coffey, and Pieter G. Kik

Description: The dynamics of Er3+ excitation in low-temperature-annealed Si-rich SiO2 are studied. It is demonstrated that Si-excess-related indirect excitation is fast (transfer time τtr<27 ns) and occurs into higher lying Er3+ levels as well as directly into the first excited state (4I13/2). By monitoring the time-dependent Er3+ emission at 1535 nm, the multilevel nature of the Er3+ sensitization is shown to result in two types of excitation of the 4I13/2 state: a fast...

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Biblioteca Hispanica : Paintings of Natural 1894

By: Joseph Albinana
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Journal of Applied Physics : Effect of compensation and of metalli...

By: Joris Libal, Sara Novaglia, Maurizio Acciarri, Simona Binetti, Roman Petres et al

Description: In this work we present a study of a p-type Czochralski-grown Si ingot which was grown using 10% solar grade silicon (SoG-Si). As the SoG-Si contains a relatively high concentration of impurities including phosphorus, the electrical properties of the as-grown wafers from this ingot are affected by both the compensating dopants and other impurities. Measurements of the minority charge carrier lifetime in the as-grown material reveal very low values (4–8 μs). ...

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Physics of Fluids : Chaotic scattering of two identical point vort...

By: Laust Tophøj and Hassan Aref

Description: A new numerical exploration suggests that the motion of two vortex pairs, with constituent vortices all of the same absolute circulation, displays chaotic scattering regimes. The mechanisms leading to chaotic scattering are different from the “slingshot effect” identified by Price [Phys. Fluids A 5, 2479 (1993) ] and occur in a different region of the four-vortex phase space. They may, in many cases, be understood by appealing to the solutions of the three-v...

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Chaos : Coherence resonance induced by colored noise near Hopf bif...

By: Juan Ma, Tiejun Xiao, Zhonghuai Hou, and Houwen Xin

Description: Effects of colored noise near supercritical Hopf bifurcation, especially noise induced oscillation (NIO) and coherence resonance (CR), have been studied analytically in the Brusselator model, using the stochastic normal form method. Two types of colored noise are considered: one is the standard Gaussian colored noise generated by the Ornstein–Uhlenbeck (OU) process and the other is the so-called power-limited (PL) process. Depending on the noise intensity an...

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Physics of Fluids : Circulation and energy of the leading vortex r...

By: L. Gao, S. C. M. Yu, J. J. Ai, and A. W. K. Law

Description: The gravity-driven starting jet characteristics over the range of Reynolds numbers from 1179 to 10 611 have been investigated using planar laser induced fluorescence and particle image velocimetry. Of the 17 cases investigated, pinch off for the leading vortex was found to appear at Reynolds number above 3000. For those cases involving pinch off, limiting values for the nondimensional circulation for the leading vortex could be identified at around 1.26 and ...

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Chaos : Global dissipativity analysis on uncertain neural networks...

By: Qiankun Song and Jinde Cao

Description: In this paper, the problems of global dissipativity and global exponential dissipativity are investigated for uncertain neural networks with discrete time-varying delay and distributed time-varying delay as well as general activation functions. By constructing appropriate Lyapunov–Krasovskii functionals and employing Newton–Leibniz formulation and linear matrix inequality (LMI) technique, several new criteria for checking the global dissipativity and global ...

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Applied Physics Letters : Photonic integration in k-space: Enhanci...

By: Mads Brøkner Christiansen, Anders Kristensen, Sanshui Xiao, and Niels Asger Mortensen

Description: We demonstrate how two optical functionalities can be implemented in a single photonic crystal structure by carefully engineering dispersion in several different bands at several different wavelengths. We use the concept for optically pumped dye doped hybrid polymer band edge lasers and show how a rectangular photonic crystal lattice imprinted into the surface can provide both feedback for in-plane band edge lasing and couple pump light into the device plane...

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Applied Physics Letters : Vertically aligned liquid crystals on a ...

By: Hong-Gyu Park, Young-Hwan Kim, Byeong-Yun Oh, Won-Kyu Lee, Byoung-Yong Kim et al

Description: Using ion-beam (IB) irradiation, liquid crystals (LCs) were vertically aligned (VA) on a γ-Al2O3 alignment film. Atomic-layer deposition was used to orient the LCs on high-quality γ-Al2O3 alignment films. The LC molecule orientation indicates the vertical direction of the atomic-layer-deposited γ-Al2O3 alignment films. X-ray photoelectron spectroscopy showed that IB irradiation changed the chemical structure, shifting the Al–O binding energy and altering the...

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Biblioteca Hispanica : Programme Lessons of a Course of Natural Hi...

By: Emilio Ribera Gomez
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The Journal of Chemical Physics : Magnetic exchange couplings from...

By: Juan E. Peralta and Veronica Barone

Description: We propose a method for the evaluation of magnetic exchange couplings based on noncollinear spin density functional calculations. The method employs the second derivative of the total Kohn–Sham energy of a single reference state, in contrast to approximations based on Kohn–Sham total energy differences. The advantage of our approach is twofold: It provides a physically motivated picture of the transition from a low-spin to a high-spin state, and it utilizes ...

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The Journal of Chemical Physics : High-pressure melting curve of h...

By: Sergio M. Davis, Anatoly B. Belonoshko, Börje Johansson, Natalia V. Skorodumova, and Adri C. van Duin

Description: The melting curve of hydrogen was computed for pressures up to 200 GPa, using molecular dynamics. The inter- and intramolecular interactions were described by the reactive force field (ReaxFF) model. The model describes the pressure-volume equation of state solid hydrogen in good agreement with experiment up to pressures over 150 GPa, however the corresponding equation of state for liquid deviates considerably from density functional theory calculations. Due...

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The Journal of Chemical Physics : Dissipation in molecular junctions

By: Ryan Jorn and Tamar Seideman

Description: A recently developed theory that formulates the phenomena of inelastic transport and current-driven dynamics in molecular-scale electronics within a time-dependent scattering approach is extended to account for dissipation of the current-induced excitation through coupling to electrode phonons and electron-hole pairs. Our approach treats the electronic transport, the nuclear dynamics, and the energy and phase exchange between the electronic and the vibration...

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Physics of Plasmas : On nonlinear evolution of Alfvénic turbulence...

By: Y. Nariyuki, T. Hada, and K. Tsubouchi

Description: Nonlinear evolution of broadband spectrum Alfvénic turbulence is studied by using one-dimensional hybrid simulations. Numerical solutions indicate that the important characteristics in the solar wind magnetohydrodynamic (MHD) turbulence are naturally reproduced by nonlinear evolution of Alfvénic turbulence with more realistic power spectrum than one used in the past studies. Namely, (i) the modulational instability can dissipate the magnetic energy of Alfvén...

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Physics of Fluids : Flow and transport in brush-coated capillaries...

By: D. I. Dimitrov, L. I. Klushin, A. Milchev, and K. Binder

Description: We apply an efficient method of forced imbibition to (nano-)capillaries, coated internally with a polymer brush, to derive the change in permeability and suction force, corresponding to different grafting densities and lengths of the polymer chains. While the fluid is modeled by simple point particles interacting with Lennard-Jones forces, the (end-grafted, fully flexible) polymers, which form the brush coating, are described by a standard bead-spring model....

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Journal of Applied Physics : Lattice contraction during amorphizat...

By: C. Suryanarayana and Satyajeet Sharma

Description: Amorphization has been achieved in blended elemental Fe-based multicomponent alloy powders by mechanical alloying. The effect of Nb addition to the Fe42Ni28Zr10−xNbxB20 alloy in the composition range of 1–6 at. % Nb has been investigated and it was shown that the glass-forming ability (GFA) of the alloys, defined as the milling time required to produce an amorphous phase, improved with Nb addition. The improvement was not regular; the highest GFA was achieve...

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Journal of Applied Physics : Analysis of the acoustoelectric behav...

By: Cinzia Caliendo

Description: Piezoelectric AlN films, 1.3–6.2 μm thick, have been grown on bare and metallized Al2O3(0001) substrates by reactive radio-frequency-sputtering technique at 180 °C. The films were uniform, stress-free, highly c-axis oriented normal to the surface, and extremely adhesive to the substrates. Surface acoustic wave (SAW) delay lines, showing harmonic modes with operating frequencies up to about 2.44 GHz, were obtained just using conventional optical lithography a...

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Applied Physics Letters : Current-induced flip-flop of magnetizati...

By: Woojin Kim, Taek Dong Lee, and Kyung-Jin Lee

Description: We performed a micromagnetic investigation of current-induced magnetization switching in perpendicular magnetic tunnel junctions with polarization-enhancement layers. The pinned layer with a polarization-enhancement layer can be excited and eventually reverses at a current density lower than the value theoretically expected from that without a polarization-enhancement layer. The reversal results in continuous flip-flops of magnetizations as long as the curre...

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